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Dear List Members - I'm looking for advice on Ion pumps. The source ion pump our VG354 thermal ionisation mass spec appears to have partially stopped working, leaving the vacuum just below 10-6 mBar. I've baked out the system with no improvement. The pump controller is common to a smaller ion pump on the analyser bench which appears to be working correctly so I suspect the actual pump itself. There are also worrying flickers on the meter of the power supply if we monitor the current being drawn by the pump. Does anyone know if the pump can be dismantled and cleaned ? Any advice on dealing with this type of problem would be gratefully received ! Thanks Andy Midwood ___________________________________________________ Dr Andy Midwood, Analytical Group, Macaulay Land Use Research Institute, Craigiebuckler, ABERDEEN, AB15 8QH, UK Tel: +44 (0) 1224 318611 Fax: +44 (0) 1224 311556 Email: [log in to unmask] http://www.mluri.sari.ac.uk